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Finding the Fourth Proportional to 762.67, 1,143.76 and 275.61

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Solution

The fourth proportional to 762.67, 1,143.76 and 275.61 is: 413.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.67 : 1,143.76 = 275.61 : x
  2. Step 2: Convert to fraction form
    762.67/1,143.76 = 275.61/x
  3. Step 3: Cross multiply
    762.67x = 1,143.76 × 275.61
  4. Step 4: Simplify right side
    762.67x = 315,231.69
  5. Step 5: Solve for x
    x = 315,231.69/762.67
  6. Step 6: Final answer
    x = 413.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.